420721010405 has 16 divisors (see below), whose sum is σ = 505931819904. Its totient is φ = 335866090560.

The previous prime is 420721010399. The next prime is 420721010443. The reversal of 420721010405 is 504010127024.

It is not a de Polignac number, because 420721010405 - 2⁶ = 420721010341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10545395 + ... + 10585215.

It is an arithmetic number, because the mean of its divisors is an integer number (31620738744).

Almost surely, 2^420721010405 is an apocalyptic number.

It is an amenable number.

420721010405 is a deficient number, since it is larger than the sum of its proper divisors (85210809499).

420721010405 is a wasteful number, since it uses less digits than its factorization.

420721010405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44236.

The product of its (nonzero) digits is 2240, while the sum is 26.

Adding to 420721010405 its reverse (504010127024), we get a palindrome (924731137429).

The spelling of 420721010405 in words is "four hundred twenty billion, seven hundred twenty-one million, ten thousand, four hundred five".